<!--
 * @Author: your name
 * @Date: 2021-12-16 16:29:45
 * @LastEditTime: 2022-01-01 11:29:25
 * @LastEditors: Please set LastEditors
 * @Description: 打开koroFileHeader查看配置 进行设置: https://github.com/OBKoro1/koro1FileHeader/wiki/%E9%85%8D%E7%BD%AE
 * @FilePath: \vue_test\src\components\Category.vue
-->
<template>
  <div>
    <h1>当前求和为：{{ sum }}</h1>
    <h3>当前求和放大10倍为：{{ bigSum }}</h3>
    <h3>我在{{ school }}，学习{{ subject }}</h3>
    <select v-model.number="n">
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
    </select>
    <button @click="increment">+</button>
    <button @click="decrement">-</button>
    <button @click="incrementOdd">当前求和为奇数再加</button>
    <button @click="incrementWait">等一等再加</button>
  </div>
</template>

<script>
import { mapState } from "vuex";
import { mapGetters } from "vuex";
export default {
  name: "Count",
  data() {
    return {
      n: 1, //用户选择的数字
      //sum: 0, //当前的和
    };
  },
  methods: {
    increment() {
      this.$store.commit("JIA", this.n);
    },
    decrement() {
      this.$store.commit("JIAN", this.n);
    },
    incrementOdd() {
      this.$store.dispatch("jiaOdd", this.n);
    },
    incrementWait() {
      //定时器
      setTimeout(() => {
        this.$store.dispatch("jiaWait", this.n);
      }, 500);
    },
  },
  computed: {
    //靠程序员自己亲自去写计算属性
    /*  sum() {
      return this.$store.state.sum;
    },
    school() {
      return this.$store.state.school;
    },
    subject() {
      return this.$store.state.subject;
    }, */
    //借助mapState生成计算属性，从state中读取数据（对象写法）
    //...mapState({sum:"sum",school:"school",subject:"subject"}),

    //借助mapState生成计算属性，从state中读取数据（数组写法，计算属性名和读取的名必须是一致的）
    ...mapState(["sum", "school", "subject"]),

    /* bigSum() {
      return this.$store.getters.bigSum;
    }, */
    //借助mapGetters生成计算属性，从getters中读取数据（对象写法）
    //...mapGetters({ bigSum: "bigSum" }),
    //借助mapGetters生成计算属性，从getters中读取数据（数组写法，计算属性名和读取的名必须是一致的）
    ...mapGetters(["bigSum"]),
  },
  mounted() {
    const x = mapState({ sum: "sum", school: "school", subject: "subject" });
    console.log(x);
  },
};
</script>

<style>
button {
  margin-left: 5px;
}
</style>
